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The Water Supply (Water Quality) Regulations 2000

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Part IV

SCHEDULE 3MONITORING

TABLE 1

PARAMETERS AND CIRCUMSTANCES FOR CHECK MONITORING

(1)(2)(3)
ItemParameterCircumstances
1.AluminiumWhen used as flocculant or where the water originates from, or is influenced by, surface waters
2.Ammonium
3.Clostridium perfringens (including spores)Where the water originates from, or is influenced by, surface waters
4.Coliform bacteria
5.Colour
6.Conductivity
7.Escherichia coli (E. coli)
8.Hydrogen ion concentration
9.IronWhen used as flocculant or where the water originates from, or is influenced by, surface waters
10.ManganeseWhere the water originates from, or is influenced by, surface waters
11.NitrateWhen chloramination is practised
12.NitriteWhen chloramination is practised
13.Odour
14.Taste
15.Turbidity

TABLE 2

ANNUAL SAMPLING FREQUENCIES: WATER SUPPLY ZONES

(1)(2)(3)(4)
Substances and parameters subject to check monitoringEstimated population of water supply zoneReducedStandard
Notes:
*

Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below.

(i)

Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.

(ii)

Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.

(iii)

Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points.

(iv)

To monitor for total indicative dose (for radioactivity).

E. coli<1004
Coliform bacteria Residual disinfectant>–10012 per 5,000 population (i)
Aluminium
Ammonium
Clostridium perfringens
Colony counts<10012
Colour100–4,99924
Conductivity*5,000–9,999612
Hydrogen ion10,000–29,9991224
Iron30,000–49,9991836
Manganese50,000–79,9992652
Nitrate (ii)80,000–99,9993876
Nitrite (ii)
Odour
Taste
Turbidity
Parameters subject to audit monitoring
Aluminium
Antimony
Arsenic
Benzene*<1001
Benzo(a)pyrene100–4,9994
Boron*5,000–99,9998
Bromate (iii)
Cadmium
Chromium
Copper
Cyanide*
1,2 dichloroethane*
Enterococci
Fluoride*
Iron
Lead
Manganese
Mercury*
Nickel
Nitrate (ii)
Nitrite (ii)
Pesticides and related products*<1001
100–4,9994
Polycyclic aromatic hydrocarbons5,000–99,9998
Selenium
Sodium
Trichloroethene/Tetrachloroethene*
Trihalomethanes
Chloride*
Sulphate*
Total organic carbon*
Tritium*
Gross alpha* (iv)
Gross beta* (iv)

TABLE 3

ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS OR SUPPLY POINTS*

(1)(2)(3)(4)(5)
ItemSubstances and parametersVolume of water supplied m3/dReducedStandard
Notes:
*

Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, subject to notes (ii) and (iii) below.

(i)

Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).

(ii)

Check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required.

(iii)

Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones.

(iv)

To monitor for total indicative dose (for radioactivity).

1.E. coli<204
2.Coliform bacteria20–1,9991252
3.Colony counts2,000–5,99952104
4.Nitrite (ii)6,000–11,999104208
5.Residual disinfectant>12,000104365
6.Turbidity
Subject to check monitoring
7.Clostridium perfringens (i)<202
20–99924
8.Conductivity1,000–1,999612
2,000–5,9991224
6,000–9,9991836
10,000–15,9992652
16,000–32,99952104
33,000–49,99978156
50,000–67,999104208
68,000–84,999130260
85,000–101,999156312
102,000–119,999183365
120,000–241,999365730
242,000–484,9997301,460
485,000–728,9991,0952,190
Subject to audit monitoring
9.Benzene
10.Boron
11.Bromate (iii)
12.Cyanide
13.1,2 dichloroethane
14.Fluoride
15.Mercury<201
16.Nitrite (ii)20–9994
17.Pesticides and1,000–49,9998
related products50,000–89,99912
90,000–299,99924
300,000–649,99936
18.Trichloroethene/Tetrachloroethene>–650,00048
19.Tetrachloromethane
20.Chloride
21.Sulphate
22.Total organic carbon
23.Tritium
24.Gross alpha (iv)
25.Gross beta (iv)

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